[resend PATCH 0/2] fix VFS register_shrinker fixup

[Michal Hocko]

Hi Andrew,
Tetsuo has posted patch 1 already [1]. I had some minor concenrs about
the changelog but the approach was already OK. Aliaksei came with an
alternative patch [2] which also handles double unregistration. I have
updated the changelog and moved the syzbot report to the 2nd patch
because it is more related to the change there. The patch 1 is
prerequisite. Maybe we should just merge those two. I've kept Tetsuo's
s-o-b and his original authorship, but let me know if you disagree with
the new wording or the additional change, Tetsuo.

The patch 2 is based on Al's suggestion [3] and it fixes sget_userns
shrinker registration code.

Both of these stalled so can we have them merged finally?

[1] http://lkml.kernel.org/r/1511523385-6433-1-git-send-email-penguin-kernel@xxxxxxxxxxxxxxxxxxx
[2] http://lkml.kernel.org/r/20171216192937.13549-1-akaraliou.dev@xxxxxxxxx
[3] http://lkml.kernel.org/r/20171123145540.GB21978@xxxxxxxxxxxxxxxxxx